How to perform this transition from block to block?

Question

css

Can you tell me how to perform a data transition from block to block?

Answer 1

Depends on layout.
If the sizes of the blocks and the distance between them are fixed, then just an image/svg/whatever.
If the blocks are not static and you are not looking for easy ways, then with a canvas:
How to calculate the coordinates also depends on the layout.
I couldn't make a curved line like in the picture :(

Answer 2

Google the canvas tag, you can use it to do tricks like this.
But my advice to you - better forget this idea))